how to have a non case sensitive url?

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PHP

Apache

web_development

Hello guys... i would like to ask how to solve the case sensitivity problem of a website? Assuming i have a website namely www.mywebsite.com and i have a subdirectory in it namely subdirectory. So when i type in the url

www.mywebsite.com/subdirectory

its taking me to my

www.mywebsite.com/subdirectory/index.php

just fine. but the problem now is that if i type in

www.mywebsite.com/Subdirectory

with a capital 'S' on the subdirectory. it gives me a 404 page not found error. I understand that i dont have a folder named as Subdirectory and i only have subdirectory but i want my website to still direct me to my page subdirectory regardless of case format of the url. like if i type in

www.MyWebsite.com/SubDirectory

i want it to still point to my subdirectory folder... How do i accomplished that? please help thanks in advance.